Camera optical lens including eight lenses of +−+−−−+− refractive powers

ABSTRACT

The present disclosure relates to the field of optical lenses and provides a camera optical lens. The camera optical lens includes, from an object side to an image side: a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; a seventh lens; and an eighth lens. The camera optical lens satisfies following conditions: 1.95≤f1/f≤3.20; f2≤0; and 1.55≤n7≤1.70, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f2 denotes a focal length of the second lens; and n7 denotes a refractive index of the seventh lens. The present disclosure can achieve ultra-thin, wide-angle lenses having a big aperture.

TECHNICAL FIELD

The present disclosure relates to the field of optical lens, and more particularly, to a camera optical lens suitable for handheld terminal devices such as smart phones or digital cameras and camera devices such as monitors or PC lenses.

BACKGROUND

With the emergence of smart phones in recent years, the demand for miniature camera lens is increasing day by day, but in general the photosensitive devices of camera lens are nothing more than Charge Coupled Device (CCD) or Complementary Metal-Oxide Semiconductor Sensor (CMOS sensor), and as the progress of the semiconductor manufacturing technology makes the pixel size of the photosensitive devices become smaller, plus the current development trend of electronic products towards better functions and thinner and smaller dimensions, miniature camera lenses with good imaging quality therefore have become a mainstream in the market.

In order to obtain better imaging quality, the lens that is traditionally equipped in mobile phone cameras adopts a three-piece or four-piece lens structure, or even a five-piece or six-piece structure. Also, with the development of technology and the increase of the diverse demands of users, and as the pixel area of photosensitive devices is becoming smaller and smaller and the requirement of the system on the imaging quality is improving constantly, an eight-piece lens structure gradually appears in lens designs. Although the common eight-piece lens has good optical performance, its settings on refractive power, lens spacing and lens shape still have some irrationality, which results in that the lens structure cannot achieve a high optical performance while satisfying design requirements for ultra-thin, wide-angle lenses having a big aperture.

SUMMARY

In view of the problems, the present disclosure aims to provide a camera lens, which can achieve a high imaging performance while satisfying design requirements for ultra-thin, wide-angle lenses.

In an embodiment, the present disclosure provides a camera optical lens. The camera optical lens includes, from an object side to an image side: a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; a seventh lens; and an eighth lens. The camera optical lens satisfies following conditions: 1.95≤f1/f≤3.20; f2≤0; and 1.55≤n7≤1.70, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f2 denotes a focal length of the second lens; and n7 denotes a refractive index of the seventh lens.

The present disclosure can achieve ultra-thin, wide-angle lenses having high optical performance and a big aperture, which are especially suitable for camera lens assembly of mobile phones and WEB camera lenses formed by CCD, CMOS and other imaging elements for high pixels.

BRIEF DESCRIPTION OF DRAWINGS

Many aspects of the exemplary embodiment can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.

FIG. 1 is a schematic diagram of a structure of a camera optical lens in accordance with Embodiment 1 of the present disclosure;

FIG. 2 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 1;

FIG. 3 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 1;

FIG. 4 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 1;

FIG. 5 is a schematic diagram of a structure of a camera optical lens in accordance with Embodiment 2 of the present disclosure;

FIG. 6 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 5;

FIG. 7 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 5;

FIG. 8 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 5;

FIG. 9 is a schematic diagram of a structure of a camera optical lens in accordance with Embodiment 3 of the present disclosure;

FIG. 10 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 9;

FIG. 11 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 9; and

FIG. 12 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 9.

DESCRIPTION OF EMBODIMENTS

The present disclosure will hereinafter be described in detail with reference to several exemplary embodiments. To make the technical problems to be solved, technical solutions and beneficial effects of the present disclosure more apparent, the present disclosure is described in further detail together with the figure and the embodiments. It should be understood the specific embodiments described hereby is only to explain the disclosure, not intended to limit the disclosure.

Embodiment 1

Referring to FIG. 1, the present disclosure provides a camera optical lens 10. FIG. 1 shows the camera optical lens 10 according to Embodiment 1 of the present disclosure. The camera optical lens 10 includes 8 lenses. Specifically, the camera optical lens 10 includes, from an object side to an image side, an aperture S1, a first lens L1 having a positive refractive power, a second lens L2 having a negative refractive power, a third lens L3 having a positive refractive power, a fourth lens L4 having a negative refractive power, a fifth lens L5 having a negative refractive power, a sixth lens L6 having a negative refractive power, a seventh lens L7 having a positive refractive power, and an eighth lens L8 having a negative refractive power. An optical element such as a glass filter (GF) can be arranged between the eighth lens L8 and an image plane Si.

Here, a focal length of the camera optical lens 10 is defined as f, and a focal length of the first lens L1 is defined as f1. The camera optical lens 10 should satisfy a condition of 1.95≤f1/f≤3.20. When the condition is satisfied, a spherical aberration and the field curvature of the system can be effectively balanced. As an example, 1.95≤f1/f≤3.18.

A focal length of the second lens L2 is defined as f2, which satisfies a condition of f2≤0. This condition specifies a sign of the focal length of the second lens. This leads to the more appropriate distribution of the refractive power, thereby achieving a better imaging quality and a lower sensitivity.

A refractive index of the seventh lens L7 is defined as n7, which satisfies a condition of 1.55≤n7≤1.70. This condition specifies the refractive index of the seventh lens. This facilitates development towards ultra-thin lenses while facilitating correction of aberrations. As an example, 1.55≤n7≤1.69.

In this embodiment, with the above configurations of the lenses, the camera optical lens 10 can achieve high performance while satisfying design requirements for a low TTL, which is defined as a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.

An on-axis thickness of the third lens is defined as d5, and an on-axis distance from an image side surface of the third lens L3 to an object side surface of the fourth lens L4 is defined as d6. The camera optical lens 10 should satisfy a condition of 10.00≤d5/d6≤27.00. This condition specifies a ratio of the thickness of the third lens and an air space between the third lens and the fourth lens. This facilitates reducing a total length of the optical system while achieving the ultra-thin effect. As an example, 10.35≤d5/d6≤26.80.

A curvature radius of an object side surface of the second lens L2 is defined as R3, and a curvature radius of an image side surface of the second lens L2 is defined as R4. The camera optical lens 10 should satisfy a condition of 6.00≤(R3+R4)/(R3−R4)≤20.00, which specifies a shape of the second lens L2. This condition can alleviate the deflection of light passing through the lens while effectively reducing aberrations. As an example, 6.40≤(R3+R4)/(R3−R4)≤19.89.

A curvature radius of the object side surface of the first lens L1 is defined as R1, and a curvature radius of an image side surface of the first lens L1 is defined as R2. The camera optical lens 10 should satisfy a condition of −18.04≤(R1+R2)/(R1−R2)≤−3.27. This condition can reasonably control a shape of the first lens in such a manner that the first lens can effectively correct aberrations of the system. As an example, −11.27≤(R1+R2)/(R1−R2)≤−4.09.

An on-axis thickness of the first lens L1 is defined as d1. The camera optical lens 10 should satisfy a condition of 0.04≤d1/TTL≤0.18. This condition can facilitate achieving ultra-thin lenses. As an example, 0.06≤d1/TTL≤0.14.

The focal length of the camera optical lens 10 is defined as f, and the focal length of the second lens L2 is defined as f2. The camera optical lens 10 should satisfy a condition of −32.24≤f2/f≤−3.65. This condition can facilitate correction aberrations of the optical system by controlling a negative refractive power of the second lens L2 within a reasonable range. As an example, −20.15≤f2/f≤−4.56.

An on-axis thickness of the second lens L2 is defined as d3. The camera optical lens 10 should satisfy a condition of 0.01≤d3/TTL≤0.04. This condition can facilitate achieving ultra-thin lenses. As an example, 0.02≤d3/TTL≤0.03.

The focal length of the camera optical lens 10 is defined as f, and the focal length of the third lens L3 is defined as f3. The camera optical lens 10 should satisfy a condition of 0.38≤f3/f≤1.66. This condition can lead to the more appropriate distribution of the refractive power, thereby achieving a better imaging quality and a lower sensitivity. As an example, 0.61≤f3/f≤1.33.

A curvature radius of an object side surface of the third lens L3 is defined as R5, and a curvature radius of an image side surface of the third lens L3 is defined as R6. The camera optical lens 10 should satisfy a condition of −0.44≤(R5+R6)/(R5−R6)≤0.32, which specifies a shape of the third lens. This condition can alleviate the deflection of light passing through the lens while effectively reducing aberrations. As an example, −0.27≤(R5+R6)/(R5−R6)≤0.25.

An on-axis thickness of the third lens L3 is defined as d5. The camera optical lens 10 should satisfy a condition of 0.04≤d5/TTL≤0.13. This condition can facilitate achieving ultra-thin lenses. As an example, 0.06≤d5/TTL≤0.10.

The focal length of the camera optical lens 10 is defined as f, and the focal length of the fourth lens L4 is defined as f4. The camera optical lens 10 should satisfy a condition of −11.84≤f4/f≤−1.27, which specifies a ratio of the focal length of the fourth lens and the focal length of the camera optical lens. This condition can facilitate improving the optical performance of the system. As an example, −7.40≤f4/f≤−1.59.

A curvature radius of an object side surface of the fourth lens L4 is defined as R7, and a curvature radius of an image side surface of the fourth lens L4 is defined as R8. The camera optical lens 10 should satisfy a condition of 0.82≤(R7+R8)/(R7−R8)≤7.85, which specifies a shape of the fourth lens L4. This can facilitate correction of an off-axis aberration with development towards ultra-thin lenses. As an example, 1.31≤(R7+R8)/(R7−R8)≤6.28.

An on-axis thickness of the fourth lens L4 is defined as d7. The camera optical lens 10 should satisfy a condition of 0.01≤d7/TTL≤0.05. This condition can facilitate achieving ultra-thin lenses. As an example, 0.02≤d7/TTL≤0.04.

The focal length of the camera optical lens 10 is defined as f, and the focal length of the fifth lens L5 is defined as f5. The camera optical lens 10 should satisfy a condition of −140.09≤f5/f≤−2.69. This condition can effectively make a light angle of the camera lens gentle and reduce the tolerance sensitivity. As an example, −87.56≤f5/f≤−3.36.

A curvature radius of an object side surface of the fifth lens L5 is defined as R9, and a curvature radius of an image side surface of the fifth lens L5 is defined as R10. The camera optical lens 10 should satisfy a condition of 0.62≤(R9+R10)/(R9−R10)≤35.56, which specifies a shape of the fifth lens L5. This can facilitate correction of an off-axis aberration with development towards ultra-thin lenses. As an example, −0.99≤(R9+R10)/(R9−R10)≤28.45.

An on-axis thickness of the fifth lens L5 is defined as d9. The camera optical lens 10 should satisfy a condition of 0.01≤d9/TTL≤0.06. This condition can facilitate achieving ultra-thin lenses. As an example, 0.02≤d9/TTL≤0.04.

The focal length of the camera optical lens 10 is defined as f, and the focal length of the sixth lens L6 is defined as f6. The camera optical lens 10 should satisfy a condition of −7.53≤f6/f≤−0.28. This condition can lead to the more appropriate distribution of the refractive power, thereby achieving a better imaging quality and a lower sensitivity. As an example, −4.71≤f6/f≤−0.35.

A curvature radius of an object side surface of the sixth lens L6 is defined as R11, and a curvature radius of an image side surface of the sixth lens L6 is defined as R12. The camera optical lens 10 should satisfy a condition of 0.52≤(R11+R12)/(R11−R12)≤3.27, which specifies a shape of the sixth lens L6. This can facilitate correction of an off-axis aberration with development towards ultra-thin lenses. As an example, 0.84≤(R11+R12)/(R11−R12)≤2.62.

An on-axis thickness of the sixth lens L6 is defined as d11. The camera optical lens 10 should satisfy a condition of 0.03≤d11/TTL≤0.13. This condition can facilitate achieving ultra-thin lenses. As an example, 0.04≤d11/TTL≤0.10.

The focal length of the camera optical lens 10 is defined as f, and the focal length of the seventh lens L7 is defined as P. The camera optical lens 10 should satisfy a condition of 0.18≤f7/f≤2.20. This condition can lead to the more appropriate distribution of the refractive power, thereby achieving a better imaging quality and a lower sensitivity. As an example, 0.29≤f7/f≤1.76.

An on-axis thickness of the seventh lens L7 is defined as d13. The camera optical lens 10 should satisfy a condition of 0.05≤d13/TTL≤0.25. This condition can facilitate achieving ultra-thin lenses. As an example, 0.08≤d13/TTL≤0.20.

A curvature radius of an object side surface of the seventh lens L7 is defined as R13, and a curvature radius of an image side surface of the seventh lens L7 is defined as R14. The camera optical lens 10 should satisfy a condition of −4.82≤(R13+R14)/(R13−R14)≤−0.87, which specifies a shape of the seventh lens L7. This can facilitate correction of an off-axis aberration with development towards ultra-thin lenses. As an example, −3.01≤(R13+R14)/(R13−R14)≤−1.08.

The focal length of the camera optical lens 10 is defined as f, and the focal length of the eighth lens L8 is defined as f8. The camera optical lens 10 should satisfy a condition of −1.85≤f8/f≤−0.57. This condition can lead to the more appropriate distribution of the refractive power, thereby achieving a better imaging quality and a lower sensitivity. As an example, −1.15≤f8/f≤−0.71.

A curvature radius of an object side surface of the eighth lens L8 is defined as R15, and a curvature radius of an image side surface of the eighth lens L8 is defined as R16. The camera optical lens 10 should satisfy a condition of −1.43≤(R15+R16)/(R15−R16)≤−0.39, which specifies a shape of the eighth lens L8. This can facilitate correction of an off-axis aberration with development towards ultra-thin lenses. As an example, −0.89≤(R15+R16)/(R15−R16)≤−0.49.

An on-axis thickness of the eighth lens L8 is defined as d15. The camera optical lens 10 should satisfy a condition of 0.02≤d15/TTL≤0.10. This condition can facilitate achieving ultra-thin lenses. As an example, 0.04≤d15/TTL≤0.08.

In this embodiment, an image height of the camera optical lens 10 is defined as IH. The camera optical lens 10 should satisfy a condition of TTL/IH≤1.40. This condition can facilitate achieving ultra-thin lenses.

In this embodiment, an F number of the camera optical lens 10 is smaller than or equal to 2.00, thereby leading to a big aperture and high imaging performance.

In this embodiment, a FOV (field of view) of the camera optical lens 10 is greater than or equal to 80°, thereby achieving the wide-angle performance.

When the focal length of the camera optical lens 10, the focal lengths of respective lenses, the refractive index of the seventh lens, the on-axis thicknesses of respective lenses, the TTL, and the curvature radius of object side surfaces and image side surfaces of respective lenses satisfy the above conditions, the camera optical lens 10 will have high optical performance while achieving ultra-thin, wide-angle lenses having a big aperture. The camera optical lens 10 is especially suitable for camera lens assembly of mobile phones and WEB camera lenses formed by CCD, CMOS and other imaging elements for high pixels.

In the following, examples will be used to describe the camera optical lens 10 of the present disclosure. The symbols recorded in each example will be described as follows. The focal length, on-axis distance, curvature radius, on-axis thickness, inflexion point position, and arrest point position are all in units of mm.

TTL: Optical length (the total optical length from the object side surface of the first lens L1 to the image plane of the camera optical lens along the optic axis) in mm.

In an example, inflexion points and/or arrest points can be arranged on the object side surface and/or image side surface of the lens, so as to satisfy the demand for the high quality imaging. The description below can be referred to for specific implementations.

Table 1 and Table 2 show design data of the camera optical lens 10 according to Embodiment 1 of the present disclosure.

TABLE 1 R d nd vd S1 ∞ d0= −0.539 R1 3.472 d1= 0.698 nd1 1.5450 v1 55.81 R2 4.338 d2= 0.329 R3 8.008 d3= 0.231 nd2 1.6701 v2 19.39 R4 7.237 d4= 0.032 R5 7.688 d5= 0.834 nd3 1.5450 v3 55.81 R6 −11.990 d6= 0.078 R7 14.835 d7= 0.260 nd4 1.6701 v4 19.39 R8 8.965 d8= 0.895 R9 30.897 d9= 0.270 nd5 1.6610 v5 20.53 R10 28.396 d10= 0.703 R11 11.884 d11= 0.719 nd6 1.6610 v6 20.53 R12 4.416 d12= 0.318 R13 2.923 d13= 1.011 nd7 1.5661 v7 37.71 R14 13.596 d14= 1.784 R15 −4.32 d15= 0.661 nd8 1.5450 v8 55.81 R16 25.797 d16= 0.375 R17 ∞ d17= 0.210 ndg 1.5168 vg 64.17 R18 ∞ d18= 0.231

In the table, meanings of various symbols will be described as follows.

S1: aperture;

R: curvature radius of an optical surface, a central curvature radius for a lens;

R1: curvature radius of the object side surface of the first lens L1;

R2: curvature radius of the image side surface of the first lens L1;

R3: curvature radius of the object side surface of the second lens L2;

R4: curvature radius of the image side surface of the second lens L2;

R5: curvature radius of the object side surface of the third lens L3;

R6: curvature radius of the image side surface of the third lens L3;

R7: curvature radius of the object side surface of the fourth lens L4;

R8: curvature radius of the image side surface of the fourth lens L4;

R9: curvature radius of the object side surface of the fifth lens L5;

R10: curvature radius of the image side surface of the fifth lens L5;

R11: curvature radius of the object side surface of the sixth lens L6;

R12: curvature radius of the image side surface of the sixth lens L6;

R13: curvature radius of the object side surface of the seventh lens L7;

R14: curvature radius of the image side surface of the seventh lens L7;

R15: curvature radius of the object side surface of the eighth lens L8;

R16: curvature radius of the image side surface of the eighth lens L8;

R17: curvature radius of an object side surface of the optical filter GF;

R18: curvature radius of an image side surface of the optical filter GF;

d: on-axis thickness of a lens and an on-axis distance between lenses;

d0: on-axis distance from the aperture S1 to the object side surface of the first lens L1;

d1: on-axis thickness of the first lens L1;

d2: on-axis distance from the image side surface of the first lens L1 to the object side surface of the second lens L2;

d3: on-axis thickness of the second lens L2;

d4: on-axis distance from the image side surface of the second lens L2 to the object side surface of the third lens L3;

d5: on-axis thickness of the third lens L3;

d6: on-axis distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4;

d7: on-axis thickness of the fourth lens L4;

d8: on-axis distance from the image side surface of the fourth lens L4 to the object side surface of the fifth lens L5;

d9: on-axis thickness of the fifth lens L5;

d10: on-axis distance from the image side surface of the fifth lens L5 to the object side surface of the sixth lens L6;

d11: on-axis thickness of the sixth lens L6;

d12: on-axis distance from the image side surface of the sixth lens L6 to the object side surface of the seventh lens L7;

d13: on-axis thickness of the seventh lens L7;

d14: on-axis distance from the image side surface of the seventh lens L7 to the object side surface of the eighth lens L8;

d15: on-axis thickness of the eighth lens L8;

d16: on-axis distance from the image side surface of the eighth lens L8 to the object side surface of the optical filter GF;

d17: on-axis thickness of the optical filter GF;

d18: on-axis distance from the image side surface of the optical filter GF to the image plane;

nd: refractive index of d line;

nd1: refractive index of d line of the first lens L1;

nd2: refractive index of d line of the second lens L2;

nd3: refractive index of d line of the third lens L3;

nd4: refractive index of d line of the fourth lens L4;

nd5: refractive index of d line of the fifth lens L5;

nd6: refractive index of d line of the sixth lens L6;

nd7: refractive index of d line of the seventh lens L7;

nd8: refractive index of d line of the eighth lens L8;

ndg: refractive index of d line of the optical filter GF;

vd: abbe number;

v1: abbe number of the first lens L1;

v2: abbe number of the second lens L2;

v3: abbe number of the third lens L3;

v4: abbe number of the fourth lens L4;

v5: abbe number of the fifth lens L5;

v6: abbe number of the sixth lens L6;

v7: abbe number of the seventh lens L7;

v8: abbe number of the eighth lens L8;

vg: abbe number of the optical filter GF.

Table 2 shows aspheric surface data of respective lens in the camera optical lens 10 according to Embodiment 1 of the present disclosure.

TABLE 2 Conic Aspherical surface coefficients coefficient k A4 A6 A8 A10 A12 A14 A16 A18 A20 R1 −7.7890E−01   5.6332E−04 −1.9140E−05 −9.1365E−04   9.2793E−04 −5.5589E−04   1.9707E−04 −4.1994E−05   4.9980E−06 −2.5783E−07 R2 −1.9649E−01 −1.2668E−04 −4.4738E−03   4.2215E−03 −3.6863E−03   2.1151E−03 −7.7783E−04   1.7105E−04 −1.9182E−05   7.6386E−07 R3   1.2067E+01 −7.5221E−03 −1.5439E−02   1.2410E−02 −6.3677E−03   2.2241E−03 −5.4688E−04   9.8530E−05 −1.1472E−05   5.7613E−07 R4 −2.0388E+01   2.5315E−02 −5.5168E−02   4.6322E−02 −2.0164E−02   3.8426E−03   2.3170E−04 −2.3790E−04   3.8591E−05 −2.0755E−06 R5   1.2544E+01   2.1138E−02 −4.9156E−02   3.9828E−02 −1.5026E−02   6.4077E−04   1.5406E−03 −5.7503E−04   8.8437E−05 −5.2848E−06 R6   5.3688E+00 −4.1330E−03 −6.0271E−03   5.5285E−03 −2.3802E−03   3.5322E−04   9.3667E−05 −4.9551E−05   8.3665E−06 −5.3368E−07 R7   3.9522E+01   8.0458E−03 −9.3433E−03   6.6533E−03 −2.4568E−03   2.2046E−04   1.6650E−04 −6.5269E−05   9.5236E−06 −5.1899E−07 R8   8.8354E+00   8.1632E−03 −3.9717E−03   6.2513E−04   1.0813E−03 −1.0015E−03   4.0629E−04 −8.8279E−05   9.9768E−06 −4.6454E−07 R9   9.9000E+01 −1.6777E−03 −9.7471E−03   2.9889E−03   6.5085E−04 −1.0400E−03   4.3952E−04 −9.6643E−05   1.1136E−05 −5.2983E−07 R10   6.0167E+00   2.0741E−03 −1.3135E−02   5.9473E−03 −1.6032E−03   1.6530E−04   2.9888E−05 −1.1938E−05   1.4605E−06 −6.2331E−08 R11 −9.9000E+01 −1.7023E−03   6.4355E−04 −4.6248E−04 −7.1455E−07   4.6604E−05 −1.5409E−05   2.3213E−06 −1.7381E−07   5.2391E−09 R12 −2.9896E+01 −1.2659E−02   4.6155E−03 −1.5099E−03   3.2676E−04 −4.7692E−05   4.4884E−06 −2.5931E−07   8.3507E−09 −1.1422E−10 R13 −1.0771E+01   1.8213E−03 −2.1095E−03   5.9537E−04 −1.5474E−04   2.5473E−05 −2.5226E−06   1.4638E−07 −4.5657E−09   5.8889E−11 R14   5.9390E+00 −1.2744E−03 −9.0099E−05 −1.3318E−04   2.0109E−05 −1.2847E−06   4.2043E−08 −6.3775E−10   1.6463E−12   3.5136E−14 R15 −6.8046E−01 −8.8309E−03   1.0260E−03 −6.1375E−05   5.7605E−06 −4.6779E−07   2.2217E−08 −5.9210E−10   8.3140E−12 −4.8062E−14 R16   1.2492E+01 −4.6200E−03 −6.2122E−05   2.5789E−05 −9.6684E−07 −2.8951E−08   3.0567E−09 −9.0427E−11   1.2103E−12 −6.2625E−15

In Table 2, k is a conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are aspheric surface coefficients.

IH: Image Height y=(x ² /R)/[1+{1−(k+1)(x ² /R ²)}^(1/2)]+A4x ⁴ +A6x ⁶ +A8x ⁸ +A10x ¹⁰ +A12x ¹² +A14x ¹⁴ +A16x ¹⁶ +A18x ¹⁸ +A20x ²⁰  (1)

In the present embodiment, an aspheric surface of each lens surface uses the aspheric surfaces shown in the above condition (1). However, the present disclosure is not limited to the aspherical polynomials form shown in the condition (1).

Table 3 and Table 4 show design data of inflexion points and arrest points of respective lens in the camera optical lens 10 according to Embodiment 1 of the present disclosure. P1R1 and P1R2 represent the object side surface and the image side surface of the first lens L1, respectively, P2R1 and P2R2 represent the object side surface and the image side surface of the second lens L2, respectively, P3R1 and P3R2 represent the object side surface and the image side surface of the third lens L3, respectively, P4R1 and P4R2 represent the object side surface and the image side surface of the fourth lens L4, respectively, P5R1 and P5R2 represent the object side surface and the image side surface of the fifth lens L5, respectively, P6R1 and P6R2 represent the object side surface and the image side surface of the sixth lens L6, respectively, P7R1 and P7R2 represent the object side surface and the image side surface of the seventh lens L7, respectively, and P8R1 and P8R2 represent the object side surface and the image side surface of the eighth lens L8, respectively. The data in the column named “inflexion point position” refers to vertical distances from inflexion points arranged on each lens surface to the optic axis of the camera optical lens 10. The data in the column named “arrest point position” refers to vertical distances from arrest points arranged on each lens surface to the optic axis of the camera optical lens 10.

TABLE 3 Number of Inflexion Inflexion Inflexion Inflexion inflexion point point point point points position 1 position 2 position 3 position 4 P1R1 1 1.835 P1R2 1 1.915 P2R1 3 0.865 1.585 1.925 P2R2 4 1.225 1.395 1.915 1.995 P3R1 2 1.895 1.985 P3R2 0 P4R1 1 2.085 P4R2 1 2.055 P5R1 1 0.595 P5R2 2 0.635 2.295 P6R1 2 1.105 2.985 P6R2 2 0.915 3.585 P7R1 1 1.335 P7R2 4 1.445 4.085 4.455 5.045 P8R1 2 2.885 6.055 P8R2 2 0.845 6.405

TABLE 4 Number of Arrest point arrest points position 1 P1R1 0 P1R2 0 P2R1 0 P2R2 0 P3R1 0 P3R2 0 P4R1 0 P4R2 1 2.305 P5R1 1 0.925 P5R2 1 0.985 P6R1 1 1.755 P6R2 1 2.025 P7R1 1 2.415 P7R2 1 2.195 P8R1 0 P8R2 1 1.465

FIG. 2 and FIG. 3 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 435 nm after passing the camera optical lens 10 according to Embodiment 1. FIG. 4 illustrates a field curvature and a distortion of light with a wavelength of 546 nm after passing the camera optical lens 10 according to Embodiment 1, in which a field curvature S is a field curvature in a sagittal direction and T is a field curvature in a tangential direction.

Table 13 below further lists various values of Embodiments 1, 2, and 3 and values corresponding to parameters which are specified in the above conditions.

As shown in Table 13, Embodiment 1 satisfies respective conditions.

In this embodiment, the entrance pupil diameter of the camera optical lens is 4.016 mm. The image height of 1.0H is 8.00 mm. The FOV (field of view) is 90.20°. Thus, the camera optical lens can achieve ultra-thin, wide-angle lenses while having on-axis and off-axis aberrations sufficiently corrected, thereby leading to better optical characteristics.

Embodiment 2

Embodiment 2 is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1, and only differences therebetween will be described in the following.

Table 5 and Table 6 show design data of a camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 5 R d nd vd S1 ∞ d0= −0.581 R1 3.404 d1= 0.825 nd1 1.5450 v1 55.81 R2 4.519 d2= 0.334 R3 8.961 d3= 0.230 nd2 1.6701 v2 19.39 R4 7.446 d4= 0.031 R5 7.885 d5= 0.800 nd3 1.5450 v3 55.81 R6 −11.916 d6= 0.030 R7 14.748 d7= 0.318 nd4 1.6701 v4 19.39 R8 10.017 d8= 0.960 R9 95.200 d9= 0.343 nd5 1.6610 v5 20.53 R10 61.358 d10= 0.753 R11 100.370 d11= 0.806 nd6 1.6610 v6 20.53 R12 2.201 d12= 0.052 R13 1.603 d13= 0.921 nd7 1.6153 v7 25.94 R14 12.347 d14= 1.856 R15 −4.493 d15= 0.543 nd8 1.5450 v8 55.81 R16 22.635 d16= 0.375 R17 ∞ d17= 0.210 ndg 1.5168 vg 64.17 R18 ∞ d18= 0.252

Table 6 shows aspheric surface data of respective lenses in the camera optical lens 20 according to Embodiment 2 of the present disclosure.

TABLE 6 Conic coefficient Aspherical surface coefficients k A4 A6 A8 A10 A12 A14 A16 A18 A20 R1 −7.0302E−01   1.9167E−03 −3.1382E−03   3.6737E−03 −2.9023E−03   1.3815E−03 −4.0762E−04   7.1848E−05 −6.8803E−06   2.7234E−07 R2 −4.0958E−01 −1.0278E−03 −1.0991E−03 −5.2211E−04   1.7415E−04 −2.8985E−05   3.0422E−05 −2.5987E−05   8.5504E−06 −9.1427E−07 R3   1.3172E+01 −1.1740E−02 −7.1922E−03   3.6839E−03 −1.3644E−03   7.2233E−04 −3.4004E−04   9.7505E−05 −1.3984E−05   7.3435E−07 R4 −2.6650E+01   8.3942E−03 −2.0163E−02   8.9347E−03   1.5327E−03 −2.8686E−03   1.0752E−03 −1.6310E−04   6.0012E−06   4.8773E−07 R5   1.2413E+01   4.9102E−03 −1.7706E−02   9.1751E−03   3.1504E−04 −2.5469E−03   1.1199E−03 −2.1204E−04   1.8208E−05 −5.5704E−07 R6   7.7272E+00 −2.9709E−03 −9.5808E−03   1.1216E−02 −7.3748E−03   2.8765E−03 −6.9328E−04   1.0233E−04 −8.3798E−06   2.8653E−07 R7   3.8901E+01   9.3306E−03 −1.2487E−02   1.1499E−02 −6.5627E−03   2.1906E−03 −3.9857E−04   3.2316E−05   7.0439E−08 −1.2200E−07 R8   9.2341E+00   8.3797E−03 −3.9926E−03   1.1874E−03   4.2263E−04 −6.6110E−04   3.0528E−04 −6.9930E−05   8.0658E−06 −3.7799E−07 R9 −2.1546E+02 −3.6837E−03 −8.7074E−03   2.8139E−03   7.0722E−04 −1.1763E−03   5.2340E−04 −1.2052E−04   1.4469E−05 −7.1548E−07 R10   5.4097E+01   2.0175E−03 −1.4063E−02   7.0568E−03 −2.1815E−03   3.2391E−04   6.9957E−06 −1.0664E−05   1.5208E−06 −7.0404E−08 R11 −9.9000E+01   1.2403E−02 −1.0982E−02   5.2464E−03 −1.8863E−03   4.6677E−04 −7.7855E−05   8.2523E−06 −4.9870E−07   1.3028E−08 R12 −2.5028E+01 −1.3266E−02   3.9210E−03 −1.0414E−03   1.8371E−04 −2.2085E−05   1.7146E−06 −8.1243E−08   2.1421E−09 −2.4187E−11 R13 −1.1642E+01   8.1302E−03 −5.3489E−03   1.6986E−03 −4.2646E−04   6.8146E−05 −6.6908E−06   3.9129E−07 −1.2464E−08   1.6608E−10 R14   5.5663E+00   4.2660E−03 −9.4636E−04 −1.7765E−04   4.5485E−05 −4.8120E−06   3.1036E−07 −1.2594E−08   2.9294E−10 −2.9566E−12 R15 −6.9164E−01 −6.3076E−03   7.4371E−04 −4.1171E−05   3.2358E−06 −2.2932E−07   9.8130E−09 −2.3802E−10   3.0575E−12 −1.6255E−14 R16   1.0624E+01 −8.6776E−03   1.1026E−03 −1.6311E−04   1.6157E−05 −9.6715E−07   3.4976E−08 −7.5020E−10   8.8034E−12 −4.3622E−14

Table 7 and Table 8 show design data of inflexion points and arrest points of respective lens in the camera optical lens 20 according to Embodiment 2 of the present disclosure.

TABLE 7 Number of Inflexion Inflexion Inflexion Inflexion inflexion point point point point points position 1 position 2 position 3 position 4 P1R1 1 1.855 P1R2 3 1.515 1.565 1.955 P2R1 3 0.795 1.575 1.925 P2R2 4 0.945 1.405 1.895 2.065 P3R1 2 1.305 1.655 P3R2 1 1.925 P4R1 1 2.105 P4R2 1 2.015 P5R1 1 0.375 P5R2 2 0.515 2.305 P6R1 2 1.025 2.945 P6R2 2 0.755 3.785 P7R1 2 1.235 3.925 P7R2 2 1.585 4.635 P8R1 2 2.995 5.885 P8R2 1 0.715

TABLE 8 Number of Arrest point Arrest point Arrest point arrest points position 1 position 2 position 3 P1R1 0 P1R2 0 P2R1 3 1.495 1.635 2.015 P2R2 0 P3R1 0 P3R2 0 P4R1 0 P4R2 0 P5R1 1 0.585 P5R2 1 0.785 P6R1 1 1.465 P6R2 1 2.075 P7R1 1 2.335 P7R2 1 2.335 P8R1 0 P8R2 1 1.305

FIG. 6 and FIG. 7 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 435 nm after passing the camera optical lens 20 according to Embodiment 2. FIG. 8 illustrates a field curvature and a distortion of light with a wavelength of 546 nm after passing the camera optical lens 20 according to Embodiment 2.

As shown in Table 13, Embodiment 2 satisfies respective conditions.

In this embodiment, the entrance pupil diameter of the camera optical lens is 4.100 mm. The image height of 1.0H is 8.00 mm. The FOV (field of view) is 89.40°. Thus, the camera optical lens can achieve ultra-thin, wide-angle lenses while having on-axis and off-axis aberrations sufficiently corrected, thereby leading to better optical characteristics.

Embodiment 3

Embodiment 3 is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1, and only differences therebetween will be described in the following.

Table 9 and Table 10 show design data of a camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 9 R d nd vd S1 ∞ d0= −0.547 R1 3.548 d1= 1.151 nd1 1.5450 v1 55.81 R2 5.365 d2= 0.287 R3 9.862 d3= 0.230 nd2 1.6701 v2 19.39 R4 7.332 d4= 0.032 R5 8.303 d5= 0.741 nd3 1.5450 v3 55.81 R6 −5.397 d6= 0.030 R7 32.365 d7= 0.260 nd4 1.6701 v4 19.39 R8 7.812 d8= 0.975 R9 176.966 d9= 0.361 nd5 1.6610 v5 20.53 R10 19.222 d10= 0.320 R11 35.221 d11= 0.506 nd6 1.6610 v6 20.53 R12 12.740 d12= 0.431 R13 5.089 d13= 1.620 nd7 1.6701 v7 19.39 R14 12.302 d14= 1.316 R15 −5.123 d15= 0.440 nd8 1.5450 v8 55.81 R16 19.747 d16= 0.375 R17 ∞ d15= 0.210 ndg 1.5168 vg 64.17 R18 ∞ d16= 0.355

Table 10 shows aspheric surface data of respective lenses in the camera optical lens 30 according to Embodiment 3 of the present disclosure.

TABLE 10 Conic coefficient Aspherical surface coefficients k A4 A6 A8 A10 A12 A14 A16 A18 A20 R1 −7.9458E−01   1.0212E−03 −1.5418E−03   1.4922E−03 −1.0748E−03   4.4303E−04 −1.1094E−04   1.5768E−05 −1.0925E−06   2.2529E−08 R2 −1.5224E+00 −3.2439E−03   1.5683E−03 −3.6213E−03   2.0429E−03 −5.5140E−04 −1.8680E−05   5.1574E−05 −1.0912E−05   7.0411E−07 R3   8.7869E+00 −2.9126E−02   1.5317E−02 −1.7599E−02   1.1524E−02 −4.3885E−03   1.0310E−03 −1.3736E−04   8.0423E−06 −4.5704E−08 R4 −9.6471E+01 −3.7981E−02   4.6544E−02 −3.3201E−02   8.2315E−03   3.0853E−03 −2.7802E−03   8.4014E−04 −1.2152E−04   6.9975E−06 R5   1.2417E+01 −5.9512E−02   7.1460E−02 −4.6223E−02   1.2612E−02   1.4621E−03 −2.2256E−03   7.0285E−04 −1.0000E−04   5.4706E−06 R6 −8.0992E+00   3.1349E−02 −3.7201E−02   2.6943E−02 −1.3852E−02   4.3770E−03 −7.1172E−04   1.5697E−05   1.2257E−05 −1.3072E−06 R7   8.2306E+01   3.1965E−02 −2.3661E−02   1.0234E−02 −2.5454E−03 −1.9077E−04   4.0566E−04 −1.3286E−04   1.9136E−05 −1.0678E−06 R8 −1.1122E+01   1.1598E−03   7.2072E−03 −9.0694E−03   5.8311E−03 −2.4300E−03   6.7634E−04 −1.1882E−04   1.1743E−05 −4.9534E−07 R9 −5.5633E+02 −6.6345E−03 −1.3603E−02   8.7564E−03 −2.9320E−03   2.7788E−04   1.4116E−04 −5.6957E−05   8.4349E−06 −4.6813E−07 R10 −1.4953E+02   6.4061E−03 −2.2007E−02   1.3554E−02 −5.5958E−03   1.5092E−03 −2.6720E−04   2.9894E−05 −1.9378E−06   5.7957E−08 R11   7.6278E+00 −1.3321E−03 −2.4533E−03   2.4185E−03 −1.4592E−03   4.8070E−04 −9.8143E−05   1.2163E−05 −8.5187E−07   2.6456E−08 R12   9.0432E+00 −3.7316E−02   1.3720E−02 −3.9142E−03   6.9003E−04 −6.2963E−05 −3.8021E−07   6.4907E−07 −5.2869E−08   1.3718E−09 R13 −3.3930E+01 −1.6897E−03 −6.4079E−03   2.7262E−03 −8.1942E−04   1.5375E−04 −1.7418E−05   1.1662E−06 −4.2505E−08   6.4918E−10 R14   4.6613E+00 −1.6352E−03 −9.1759E−04   6.6757E−05   2.8332E−06 −1.0455E−06   1.0072E−07 −4.8986E−09   1.2067E−10 −1.1940E−12 R15 −6.8986E−01 −4.7569E−03   4.6771E−04 −1.8382E−05   1.2360E−06 −9.0055E−08   3.9585E−09 −9.8919E−11   1.3239E−12 −7.4319E−15 R16   6.6198E+00 −8.5884E−03   3.9288E−04 −3.8686E−05   6.0143E−06 −4.7060E−07   1.9353E−08 −4.3880E−10   5.2292E−12 −2.5712E−14

Table 11 and Table 12 show design data of inflexion points and arrest points of respective lens in the camera optical lens 30 according to Embodiment 3 of the present disclosure.

TABLE 11 Number of Inflexion Inflexion Inflexion Inflexion inflexion point point point point points position 1 position 2 position 3 position 4 P1R1 1 1.825 P1R2 3 1.265 1.655 2.065 P2R1 2 0.635 1.535 P2R2 4 0.665 1.455 1.915 2.065 P3R1 3 1.215 1.595 1.965 P3R2 2 1.835 1.945 P4R1 1 1.955 P4R2 1 2.095 P5R1 1 0.245 P5R2 2 0.655 2.375 P6R1 2 0.915 2.665 P6R2 3 0.475 2.875 3.135 P7R1 4 0.855 3.075 3.585 3.695 P7R2 2 1.285 4.695 P8R1 2 3.135 5.785 P8R2 3 0.735 5.185 5.955

TABLE 12 Number of Arrest point Arrest point arrest points position 1 position 2 P1R1 0 P1R2 0 P2R1 2 1.105 1.795 P2R2 2 1.315 1.555 P3R1 1 2.095 P3R2 0 P4R1 1 2.145 P4R2 0 P5R1 1 0.385 P5R2 1 1.035 P6R1 1 1.395 P6R2 1 0.895 P7R1 1 1.535 P7R2 1 2.065 P8R1 0 P8R2 1 1.285

FIG. 10 and FIG. 11 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 435 nm after passing the camera optical lens 30 according to Embodiment 3. FIG. 12 illustrates field curvature and distortion of light with a wavelength of 546 nm after passing the camera optical lens 30 according to Embodiment 3.

Table 13 below further lists various values of the present embodiment and values corresponding to parameters which are specified in the above conditions. Obviously, the camera optical lens according to this embodiment satisfies the above conditions.

In this embodiment, the entrance pupil diameter of the camera optical lens is 4.103 mm. The image height of 1.0H is 8.00 mm. The FOV (field of view) is 89.40°. Thus, the camera optical lens can achieve ultra-thin, wide-angle lenses while having on-axis and off-axis aberrations sufficiently corrected, thereby leading to better optical characteristics.

TABLE 13 Parameters and Conditions Embodiment 1 Embodiment 2 Embodiment 3 f1/f 3.16 2.50 1.96 f2 −126.22 −69.19 −43.75 n7 1.57 1.62 1.67 f  7.830 7.994 8.000 f1 24.727 19.976 15.640 f3 8.689 8.796 6.093 f4 −34.013 −47.324 −15.248 f5 −548.452 −259.198 −32.281 f6 −10.930 −3.377 −30.122 f7 6.319 2.873 11.732 f8 −6.709 −6.802 −7.386  f12 29.666 26.517 22.256 Fno 1.95 1.95 1.95

Fno denotes an F number of the camera optical lens.

It can be appreciated by one having ordinary skill in the art that the description above is only embodiments of the present disclosure. In practice, one having ordinary skill in the art can make various modifications to these embodiments in forms and details without departing from the spirit and scope of the present disclosure. 

What is claimed is:
 1. A camera optical lens, comprising, from an object side to an image side: a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a positive refractive power; a fourth lens having a negative refractive power; a fifth lens having a negative refractive power; a sixth lens having a negative refractive power; a seventh lens having a positive refractive power; and an eighth lens having a negative refractive power, wherein the camera optical lens satisfies following conditions: 1.95≤f1/f≤3.20; f2<0; and 1.55≤n7≤1.70, wherein f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f2 denotes a focal length of the second lens; and n7 denotes a refractive index of the seventh lens.
 2. The camera optical lens as described in claim 1, further satisfying a following condition: 10.00≤d5/d6≤27.00, where d5 denotes an on-axis thickness of the third lens; and d6 denotes an on-axis distance from an image side surface of the third lens to an object side surface of the fourth lens.
 3. The camera optical lens as described in claim 1, further satisfying a following condition: 6.00≤(R3+R4)/(R3−R4)≤20.00, where R3 denotes a curvature radius of an object side surface of the second lens; and R4 denotes a curvature radius of an image side surface of the second lens.
 4. The camera optical lens as described in claim 1, further satisfying following conditions: −18.04≤(R1+R2)/(R1−R2)≤−3.27; and 0.04≤d1/TTL≤0.18, where R1 denotes a curvature radius of an object side surface of the first lens; R2 denotes a curvature radius of an image side surface of the first lens; d1 denotes an on-axis thickness of the first lens; and TTL denotes a total optical length from the object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 5. The camera optical lens as described in claim 1, further satisfying following conditions: −32.24≤f2/f≤−3.65; and 0.01≤d3/TTL≤0.04, where d3 denotes an on-axis thickness of the second lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 6. The camera optical lens as described in claim 1, further satisfying following conditions: 0.38≤f3/f≤1.66; −0.44≤(R5+R6)/(R5−R6)≤0.32; and 0.04≤d5/TTL≤0.13, where f3 denotes a focal length of the third lens; R5 denotes a curvature radius of an object side surface of the third lens; R6 denotes a curvature radius of an image side surface of the third lens; d5 denotes an on-axis thickness of the third lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 7. The camera optical lens as described in claim 1, further satisfying following conditions: −11.84≤f4/f≤−1.27; 0.82≤(R7+R8)/(R7−R8)≤7.85; and 0.01≤d7/TTL≤0.05, where f4 denotes a focal length of the fourth lens; R7 denotes a curvature radius of an object side surface of the fourth lens; R8 denotes a curvature radius of an image side surface of the fourth lens; d7 denotes an on-axis thickness of the fourth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 8. The camera optical lens as described in claim 1, further satisfying following conditions: −140.09≤f5/f≤−2.69; 0.62≤(R9+R10)/(R9−R10)≤35.56; and 0.01≤d9/TTL≤0.06, where f5 denotes a focal length of the fifth lens; R9 denotes a curvature radius of an object side surface of the fifth lens; R10 denotes a curvature radius of an image side surface of the fifth lens; d9 denotes an on-axis thickness of the fifth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 9. The camera optical lens as described in claim 1, further satisfying following conditions: −7.53≤f6/f≤−0.28; 0.52≤(R11+R12)/(R11−R12)≤3.27; and 0.03≤d11/TTL≤0.13, where f6 denotes a focal length of the sixth lens; R11 denotes a curvature radius of an object side surface of the sixth lens; R12 denotes a curvature radius of an image side surface of the sixth lens; d11 denotes an on-axis thickness of the sixth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 10. The camera optical lens as described in claim 1, further satisfying following conditions: 0.18≤f7/f≤2.20; −4.82≤(R13+R14)/(R13−R14)≤−0.87; and 0.05≤d13/TTL≤0.25, where f7 denotes a focal length of the seventh lens; R13 denotes a curvature radius of an object side surface of the seventh lens; R14 denotes a curvature radius of an image side surface of the seventh lens; d13 denotes an on-axis thickness of the seventh lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis. 